86019991 has 2 divisors, whose sum is σ = 86019992. Its totient is φ = 86019990.

The previous prime is 86019961. The next prime is 86020031. The reversal of 86019991 is 19991068.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86019991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86019911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43009995 + 43009996.

It is an arithmetic number, because the mean of its divisors is an integer number (43009996).

Almost surely, 2^86019991 is an apocalyptic number.

86019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

86019991 is an equidigital number, since it uses as much as digits as its factorization.

86019991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 86019991 is about 9274.6962753505. The cubic root of 86019991 is about 441.4346952895.

The spelling of 86019991 in words is "eighty-six million, nineteen thousand, nine hundred ninety-one".